LIGHT SENSING CIRCUIT, LIQUID CRYSTAL DISPLAY COMPRISING THE SAME AND DRIVIDNG METHOD OF THE SAME

• Main Author: WOO, DOO HYUNG
• Format: Patent
• Language: English; Korean
• Published: 03.03.2010
• Subjects: ADVERTISING; ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICESUSING STATIC MEANS TO PRESENT VARIABLE INFORMATION; COLORIMETRY; CRYPTOGRAPHY; DEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH ISMODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THEDEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY,COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g.SWITCHING, GATING, MODULATING OR DEMODULATING; DISPLAY; EDUCATION; FREQUENCY-CHANGING; MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT,POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRA-RED,VISIBLE OR ULTRA-VIOLET LIGHT; MEASURING; NON-LINEAR OPTICS; OPTICAL ANALOGUE/DIGITAL CONVERTERS; OPTICAL LOGIC ELEMENTS; OPTICS; PHYSICS; RADIATION PYROMETRY; SEALS; TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF; TESTING

PURPOSE: A light sensing circuit, a liquid crystal display comprising the same and driving method of the same are provided to obtain same digital output at about the same ambient light without the deviation between sensors. CONSTITUTION: A light sensing circuit includes a sensor unit(120), a voltage generation unit, and a readout circuit(130). The sensor unit outputs a first different value between a third current and a second current and it outputs a second difference value between a first current and a second current. The voltage generation unit generates reference voltage in response to the first difference value and also generates sensing voltage in response to the second difference value. The readout circuit detects the first rise time and detects a second rise time based on the detected first rise time, and then outputs the detected second rise time as the luminance of an external light.